A novel method of distribution system reconfiguration for loss reduction in a real-time implementation is presented. The distribution system is represented as a hypergraph, the edge weights being representative of line section losses. Using an eigenvector approach to generate a good partition and the Sanchis interchange method to obtain a near-optimal solution, the distribution system is partitioned into blocks of busses. Through the use of existing tie and sectionalizing switches, switching combinations are introduced to preserve the blocks. This technique allows for a heuristic to very rapidly determine switching combinations required for near-optimal configuration for loss minimization. Subsequent trials of this technique on actual feeder data demonstrate the benefits that it could bring to a utility.<>
{"title":"Loss reduction in distribution systems: a new approach using partitioning techniques","authors":"R. Sárfi, M. Salama, A. Vannelli, A. Chikhani","doi":"10.1109/IAS.1993.299179","DOIUrl":"https://doi.org/10.1109/IAS.1993.299179","url":null,"abstract":"A novel method of distribution system reconfiguration for loss reduction in a real-time implementation is presented. The distribution system is represented as a hypergraph, the edge weights being representative of line section losses. Using an eigenvector approach to generate a good partition and the Sanchis interchange method to obtain a near-optimal solution, the distribution system is partitioned into blocks of busses. Through the use of existing tie and sectionalizing switches, switching combinations are introduced to preserve the blocks. This technique allows for a heuristic to very rapidly determine switching combinations required for near-optimal configuration for loss minimization. Subsequent trials of this technique on actual feeder data demonstrate the benefits that it could bring to a utility.<<ETX>>","PeriodicalId":345027,"journal":{"name":"Conference Record of the 1993 IEEE Industry Applications Conference Twenty-Eighth IAS Annual Meeting","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1993-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122613774","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
It has been shown that many desktop personal computers and peripherals are left on when they are not being used, wasting energy. The authors monitored desktop computer use patterns on 33 machines using custom activity monitoring software, and predicted a reduction in mean computer energy consumption of 71% with a 36% reduction in mean peak power demand, if computers were automatically switched off after 60 minutes of inactivity. Field trials of an automatic power management system designed to switch off computers and peripherals after a specified period of inactivity produced reductions in mean computer energy consumption of 63%, with a reduction in mean peak power demand of 35%; visual display unit mean energy consumption was reduced by 82%. All these savings were maintained with time.<>
{"title":"Automatic power management of desktop computers","authors":"D. Tiller, D. Phil, G. Newsham","doi":"10.1109/IAS.1993.299143","DOIUrl":"https://doi.org/10.1109/IAS.1993.299143","url":null,"abstract":"It has been shown that many desktop personal computers and peripherals are left on when they are not being used, wasting energy. The authors monitored desktop computer use patterns on 33 machines using custom activity monitoring software, and predicted a reduction in mean computer energy consumption of 71% with a 36% reduction in mean peak power demand, if computers were automatically switched off after 60 minutes of inactivity. Field trials of an automatic power management system designed to switch off computers and peripherals after a specified period of inactivity produced reductions in mean computer energy consumption of 63%, with a reduction in mean peak power demand of 35%; visual display unit mean energy consumption was reduced by 82%. All these savings were maintained with time.<<ETX>>","PeriodicalId":345027,"journal":{"name":"Conference Record of the 1993 IEEE Industry Applications Conference Twenty-Eighth IAS Annual Meeting","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1993-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114460616","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
A capacitively coupled DC-AC power converter which is capable of zero current soft switching is presented. A form of amplitude modulation is introduced to provide a sinusoidal output waveform. Due to its favorable current stresses on the switches, this converter is suitable for high current high power inductive load applications. With this technique, switching losses can be reduced. The soft switching method is accomplished by the alternating voltage of the capacitor. The series inductive snubbers assure the zero current turn-on of the switches. Reduction of the switching losses implies that the switching frequency and the overall system efficiency can be increased for high-power gate-turn-off devices. Since this converter can operate at higher switching frequencies, the reactive component sizes can be decreased and the power density can be raised in high-power applications. The zero current soft switching method makes the capacitively coupled converter suitable for high-current, high-power inductive load applications, such as motor drives, without significantly increasing the conduction losses.<>
{"title":"Soft switched capacitively coupled DC-AC converter for high power","authors":"M. Ehsani, T.S. Wu","doi":"10.1109/IAS.1993.298990","DOIUrl":"https://doi.org/10.1109/IAS.1993.298990","url":null,"abstract":"A capacitively coupled DC-AC power converter which is capable of zero current soft switching is presented. A form of amplitude modulation is introduced to provide a sinusoidal output waveform. Due to its favorable current stresses on the switches, this converter is suitable for high current high power inductive load applications. With this technique, switching losses can be reduced. The soft switching method is accomplished by the alternating voltage of the capacitor. The series inductive snubbers assure the zero current turn-on of the switches. Reduction of the switching losses implies that the switching frequency and the overall system efficiency can be increased for high-power gate-turn-off devices. Since this converter can operate at higher switching frequencies, the reactive component sizes can be decreased and the power density can be raised in high-power applications. The zero current soft switching method makes the capacitively coupled converter suitable for high-current, high-power inductive load applications, such as motor drives, without significantly increasing the conduction losses.<<ETX>>","PeriodicalId":345027,"journal":{"name":"Conference Record of the 1993 IEEE Industry Applications Conference Twenty-Eighth IAS Annual Meeting","volume":"82 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1993-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128759651","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
An experimental investigation has been carried out in a rectangular lucite cell equipped with parallel electrode plates along the two sides of the cell. The droplets are formed at a grounded hollow electrode. Distilled water is used as the droplet phase and a viscous mineral oil is used as the continuous phase. Experiments have been conducted at various flow rates of the dispersed phase with quiescent continuous phase; the applied DC voltage is from 0 to 15 kV. Charge acquired on droplets both at the hollow electrode and downstream near the bottom of the cell was observed from hollow electrode current waveforms and by a Faraday-cup through direct sampling, respectively. The results reported from the present investigation, extending from the single discrete droplet regime (at low applied voltage) to the dispersed multidroplet regime (at high applied voltage), indicate that the modified Rayleigh instability model and the Vonnegut and Neubauer model can predict the maximum droplet charge acquired in liquid-liquid systems. The modified Vonnegut model can predict most of the experimental results when the applied electric field is high enough and EHD (electrohydrodynamic) forces become dominant.<>
{"title":"Droplet charge-to-mass ratio measurement in an EHD liquid-liquid extraction system","authors":"W. He, J. Chang, M. Baird","doi":"10.1109/IAS.1993.299124","DOIUrl":"https://doi.org/10.1109/IAS.1993.299124","url":null,"abstract":"An experimental investigation has been carried out in a rectangular lucite cell equipped with parallel electrode plates along the two sides of the cell. The droplets are formed at a grounded hollow electrode. Distilled water is used as the droplet phase and a viscous mineral oil is used as the continuous phase. Experiments have been conducted at various flow rates of the dispersed phase with quiescent continuous phase; the applied DC voltage is from 0 to 15 kV. Charge acquired on droplets both at the hollow electrode and downstream near the bottom of the cell was observed from hollow electrode current waveforms and by a Faraday-cup through direct sampling, respectively. The results reported from the present investigation, extending from the single discrete droplet regime (at low applied voltage) to the dispersed multidroplet regime (at high applied voltage), indicate that the modified Rayleigh instability model and the Vonnegut and Neubauer model can predict the maximum droplet charge acquired in liquid-liquid systems. The modified Vonnegut model can predict most of the experimental results when the applied electric field is high enough and EHD (electrohydrodynamic) forces become dominant.<<ETX>>","PeriodicalId":345027,"journal":{"name":"Conference Record of the 1993 IEEE Industry Applications Conference Twenty-Eighth IAS Annual Meeting","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1993-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128368317","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The application of fuzzy logic theory to control a direct-drive DC motor in a robot arm is studied. The design of a fuzzy logic controller for position control of a single-link robot arm is presented. Simulation results show that the response of the fuzzy controller is very good, and it remains the same when the load mass changes in a wide range. The designed fuzzy controller has been implemented on an 8-bit microcontroller (68HC11) to evaluate the obtainable performance with a low-cost processor. Even with a relatively low sampling rate (66 Hz) due to the limited execution speed of the microcontroller, the fuzzy logic controller performs well in a wide range of operating conditions. Good experimental results were obtained, illustrating the high robustness of the controller to the load mass change.<>
{"title":"Control of a direct-drive DC motor by fuzzy logic","authors":"H. Le-Huy, M. Hamdi","doi":"10.1109/IAS.1993.298871","DOIUrl":"https://doi.org/10.1109/IAS.1993.298871","url":null,"abstract":"The application of fuzzy logic theory to control a direct-drive DC motor in a robot arm is studied. The design of a fuzzy logic controller for position control of a single-link robot arm is presented. Simulation results show that the response of the fuzzy controller is very good, and it remains the same when the load mass changes in a wide range. The designed fuzzy controller has been implemented on an 8-bit microcontroller (68HC11) to evaluate the obtainable performance with a low-cost processor. Even with a relatively low sampling rate (66 Hz) due to the limited execution speed of the microcontroller, the fuzzy logic controller performs well in a wide range of operating conditions. Good experimental results were obtained, illustrating the high robustness of the controller to the load mass change.<<ETX>>","PeriodicalId":345027,"journal":{"name":"Conference Record of the 1993 IEEE Industry Applications Conference Twenty-Eighth IAS Annual Meeting","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1993-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128653419","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Measurements have been made evaluating the switching and conduction characteristics of the first commercially available 600-V MCT (MOS controlled thyristor), the second-generation, 600-V MCT still under development, and a fast commercially N-IGBT (insulated-gate bipolar transistor). The data presented indicate that great strides have been made in improving the electrical performance of the P-MCT in the generation 2 device. Using the fmax curve as a figure of merit, the lower switching losses of the N-IGBT are favorable, under the test conditions used, compared to the generation 1 P-MCT up to approximately 50 A. The lower conduction losses of the MCT become the predominant factor for larger current levels. The generation 2 P-MCT combines the same conduction loss characteristics as its predecessor, with drastic reductions in turn-off switching times and losses. The combined effect gives the generation 2 P-MCT the lowest losses over the whole current and frequency range evaluated. The N-IGBT provides a better safe operating area than either of the P-MCTs, though capacitive snubbers can be employed to improve this situation.<>
测量已经评估了第一代商用600 v MCT (MOS控制晶闸管)的开关和传导特性，第二代600 v MCT仍在开发中，以及快速商用N-IGBT(绝缘栅双极晶体管)。所提供的数据表明，在第2代设备中，P-MCT的电气性能已经取得了很大的进步。使用fmax曲线作为性能指标，在使用的测试条件下，与第一代P-MCT相比，N-IGBT的低开关损耗是有利的，最高可达约50 a。MCT较低的传导损耗成为大电流水平的主要因素。第二代P-MCT结合了与其前身相同的传导损耗特性，并大大减少了关断时间和损耗。综合效应使第2代P-MCT在整个电流和频率范围内具有最低的损耗。与p - mct相比，N-IGBT提供了更好的安全操作区域，尽管可以使用电容缓冲器来改善这种情况。
{"title":"Switching comparison of generation 1 and generation 2P-MCTs and ultrafast N-IGBTs","authors":"P.D. Kendle, V. Temple, S. Arthur","doi":"10.1109/IAS.1993.299098","DOIUrl":"https://doi.org/10.1109/IAS.1993.299098","url":null,"abstract":"Measurements have been made evaluating the switching and conduction characteristics of the first commercially available 600-V MCT (MOS controlled thyristor), the second-generation, 600-V MCT still under development, and a fast commercially N-IGBT (insulated-gate bipolar transistor). The data presented indicate that great strides have been made in improving the electrical performance of the P-MCT in the generation 2 device. Using the fmax curve as a figure of merit, the lower switching losses of the N-IGBT are favorable, under the test conditions used, compared to the generation 1 P-MCT up to approximately 50 A. The lower conduction losses of the MCT become the predominant factor for larger current levels. The generation 2 P-MCT combines the same conduction loss characteristics as its predecessor, with drastic reductions in turn-off switching times and losses. The combined effect gives the generation 2 P-MCT the lowest losses over the whole current and frequency range evaluated. The N-IGBT provides a better safe operating area than either of the P-MCTs, though capacitive snubbers can be employed to improve this situation.<<ETX>>","PeriodicalId":345027,"journal":{"name":"Conference Record of the 1993 IEEE Industry Applications Conference Twenty-Eighth IAS Annual Meeting","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1993-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129336753","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Object-oriented programming is introduced as a new approach for implementing software to solve fuzzy logic control problems. The object-oriented approach does a better job in supporting rapid prototyping. It allows users to gradually refine a subset of objects and operations. In the initial program testing phase, C++ fuzzy objects were used to generate a control decision table and control motor speed. The authors experienced no difficulty in modifying the C++ object functions into pure C functions for gaining portability and execution speed, which made this approach more attractive than a pure procedure-oriented approach. The object-oriented approach using C++ appears to be the appropriate technology for an FLC (fuzzy logic controller)-based DC motor speed control application. It enables a more flexible programming environment and reduces the efforts for fuzzy-object development and maintenance.<>
{"title":"Development of fuzzy-logic processing objects for industrial control applications","authors":"P. Lin","doi":"10.1109/IAS.1993.299140","DOIUrl":"https://doi.org/10.1109/IAS.1993.299140","url":null,"abstract":"Object-oriented programming is introduced as a new approach for implementing software to solve fuzzy logic control problems. The object-oriented approach does a better job in supporting rapid prototyping. It allows users to gradually refine a subset of objects and operations. In the initial program testing phase, C++ fuzzy objects were used to generate a control decision table and control motor speed. The authors experienced no difficulty in modifying the C++ object functions into pure C functions for gaining portability and execution speed, which made this approach more attractive than a pure procedure-oriented approach. The object-oriented approach using C++ appears to be the appropriate technology for an FLC (fuzzy logic controller)-based DC motor speed control application. It enables a more flexible programming environment and reduces the efforts for fuzzy-object development and maintenance.<<ETX>>","PeriodicalId":345027,"journal":{"name":"Conference Record of the 1993 IEEE Industry Applications Conference Twenty-Eighth IAS Annual Meeting","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1993-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129486419","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Antonio Berizzi, A. Silvestri, Dario Zaninelli, S. Massucco
A comparison is presented between two of the most significant international standards for short-circuit calculation: the IEC 909 Standard and the ANSI/IEEE C37.010-1979. The ANSI standard is more oriented toward breaker selection while the IEC standard gives general guidelines for short-circuit current computation. A set of short-circuit currents, directly extracted from the standards or obtainable after some elaborations, were determined as values useful for the comparison. A detailed dynamic analysis performed by using a well-known program for electromagnetic simulation was used as reference for the comparison between the two standards. The comparison shows that the IEC 909 is somewhat more ponderous than the ANSI standard. Hypothesis and assumptions are more numerous and more detailed in the IEC 909 than in the ANSI standard. In the former standard, more information and more formulas about the possibility of neglecting motor contributions are presented, as well as the basis for determining whether short-circuit is to be considered near or far from generators. The results of calculations confirm that both standards give satisfactory approximations of the short-circuit currents, which are mostly on the safety side.<>
{"title":"Short-circuit current calculation: a comparison between methods of IEC and ANSI standards using dynamic simulation as reference","authors":"Antonio Berizzi, A. Silvestri, Dario Zaninelli, S. Massucco","doi":"10.1109/IAS.1993.299168","DOIUrl":"https://doi.org/10.1109/IAS.1993.299168","url":null,"abstract":"A comparison is presented between two of the most significant international standards for short-circuit calculation: the IEC 909 Standard and the ANSI/IEEE C37.010-1979. The ANSI standard is more oriented toward breaker selection while the IEC standard gives general guidelines for short-circuit current computation. A set of short-circuit currents, directly extracted from the standards or obtainable after some elaborations, were determined as values useful for the comparison. A detailed dynamic analysis performed by using a well-known program for electromagnetic simulation was used as reference for the comparison between the two standards. The comparison shows that the IEC 909 is somewhat more ponderous than the ANSI standard. Hypothesis and assumptions are more numerous and more detailed in the IEC 909 than in the ANSI standard. In the former standard, more information and more formulas about the possibility of neglecting motor contributions are presented, as well as the basis for determining whether short-circuit is to be considered near or far from generators. The results of calculations confirm that both standards give satisfactory approximations of the short-circuit currents, which are mostly on the safety side.<<ETX>>","PeriodicalId":345027,"journal":{"name":"Conference Record of the 1993 IEEE Industry Applications Conference Twenty-Eighth IAS Annual Meeting","volume":"73 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1993-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130300014","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The thermal characteristic of a power semiconductor device is defined by its transient thermal impedance (TTZ) curve. This curve is the only thermal information normally available to the equipment designer. The TTZ curve, however, is only valid for a device mounted on an infinite heat sink with no thermal interface resistance. If heat flow across the interface is not constant, the semiconductor and heat sink form a composite thermal system and the TTZ curve is no longer applicable. The authors present a technique for modeling the semiconductor and heat sink as distributed R/C networks, the semiconductor network being chosen so as to match the TTZ curve for the device over the time period of interest. The model has a theoretically sound basis and it allows a TTZ curve to be developed for the system. The model is especially valuable for applications in which the semiconductor current is of pulse durations spanning the transition range of the TTZ curve.<>
{"title":"Transient thermal impedance modeling of semiconductor heat sinking","authors":"K.H. Sueker","doi":"10.1109/IAS.1993.299072","DOIUrl":"https://doi.org/10.1109/IAS.1993.299072","url":null,"abstract":"The thermal characteristic of a power semiconductor device is defined by its transient thermal impedance (TTZ) curve. This curve is the only thermal information normally available to the equipment designer. The TTZ curve, however, is only valid for a device mounted on an infinite heat sink with no thermal interface resistance. If heat flow across the interface is not constant, the semiconductor and heat sink form a composite thermal system and the TTZ curve is no longer applicable. The authors present a technique for modeling the semiconductor and heat sink as distributed R/C networks, the semiconductor network being chosen so as to match the TTZ curve for the device over the time period of interest. The model has a theoretically sound basis and it allows a TTZ curve to be developed for the system. The model is especially valuable for applications in which the semiconductor current is of pulse durations spanning the transition range of the TTZ curve.<<ETX>>","PeriodicalId":345027,"journal":{"name":"Conference Record of the 1993 IEEE Industry Applications Conference Twenty-Eighth IAS Annual Meeting","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1993-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130488367","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
A miniature electrostatic induction type motor has been fabricated, and parameters influencing the motor speed, such as voltage and frequency of the three-phase AC power supply, the resistivity and relative dielectric constant of the rotor surface materials, the relaxation time constants, and the resistivity of the rotor liner materials have been studied. The no load motor speed was proportional to the applied three-phase AC voltage. The motor speed increased linearly with increase of the applied frequency of the three-phase AC power supply, having a critical frequency at the higher frequency where partial discharges take place in the air gap between the rotor and the stator. This characteristic makes it possible to control the speed linearly by changing the applied frequency. The maximum no-load rotor speed of the motor tested was about 5500 RPM at an applied voltage of 4.5 kV and a frequency of 220 Hz for a rotor surface material of BaTiO/sub 3/ 80% in the resin binder layered on the copper-foil rotor liner material.<>
{"title":"A miniature size electrostatic induction motor","authors":"J. Moon, D.H. Lee","doi":"10.1109/IAS.1993.299080","DOIUrl":"https://doi.org/10.1109/IAS.1993.299080","url":null,"abstract":"A miniature electrostatic induction type motor has been fabricated, and parameters influencing the motor speed, such as voltage and frequency of the three-phase AC power supply, the resistivity and relative dielectric constant of the rotor surface materials, the relaxation time constants, and the resistivity of the rotor liner materials have been studied. The no load motor speed was proportional to the applied three-phase AC voltage. The motor speed increased linearly with increase of the applied frequency of the three-phase AC power supply, having a critical frequency at the higher frequency where partial discharges take place in the air gap between the rotor and the stator. This characteristic makes it possible to control the speed linearly by changing the applied frequency. The maximum no-load rotor speed of the motor tested was about 5500 RPM at an applied voltage of 4.5 kV and a frequency of 220 Hz for a rotor surface material of BaTiO/sub 3/ 80% in the resin binder layered on the copper-foil rotor liner material.<<ETX>>","PeriodicalId":345027,"journal":{"name":"Conference Record of the 1993 IEEE Industry Applications Conference Twenty-Eighth IAS Annual Meeting","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1993-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130576572","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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